AbstractA mild and efficient reaction for synthesizing esters from thioamide precursors has been established. This method is accomplished in one pot under mild conditions. The process involves the alkylation and activation of inert thioamides, which leads to the cleavage of stable C–N and C–S bonds, eventually resulting in valuable esters with a broad range of substrates. The transformation can be easily carried out at room temperature using thioamide substrates, reactants, and activating agents. This protocol has been demonstrated by synthesizing important esters with applications.
General Construction of Thioamides under Mild Conditions: A Stepwise Proton Transfer Process Mediated by EDTA
作者:Hao Jin、Xin Ge、Shaodong Zhou
DOI:10.1002/ejoc.202101013
日期:2021.11.25
of experiments and quantum chemical calculations. Ester, amide, and elemental sulfur are employed as the starting materials and ethylene diamine tetraacetic acid (EDTA) serves as the catalyst to facilitate the benign reaction. The catalytic role of EDTA is attributed to a stepwise proton transfer process in which EDTA transports a proton from the benzyl carbon to a sulfur atom.
Thiocarbamoylation of hydrazones of aromatic aldehydes with tetramethylthiuram disulfide (TMTD) afforded diarylaldazines, 4,4-dimethylthiosemicarbazide, and 5-dimethylamino-1,3,4-thiadiazole-2-thiol. In addition, the reaction of TMTD with salicylaldehyde hydrazone yielded symmetrical thiocarbonyldihydrazone of salicylaldehyde, whereas the reactions with p-bromobenzaldehyde and m-nitrobenzaldehyde hydrazones afforded p-bromo- N, N-dimethyl- and N,N-dimethyl-m-nitrothiobenzamides, respectively. Possible pathways of formation of the resulting products are discussed.
作者:Vankar, Jigarkumar K.、Jadav, Jaydeepbhai P.、Gururaja, Guddeangadi N.
DOI:10.1055/s-0043-1774910
日期:——
AbstractA mild and efficient reaction for synthesizing esters from thioamide precursors has been established. This method is accomplished in one pot under mild conditions. The process involves the alkylation and activation of inert thioamides, which leads to the cleavage of stable C–N and C–S bonds, eventually resulting in valuable esters with a broad range of substrates. The transformation can be easily carried out at room temperature using thioamide substrates, reactants, and activating agents. This protocol has been demonstrated by synthesizing important esters with applications.